Blur Busters Forums

Hello.

I've CRT monitor 19" and GTX 980 Ti SC+ with 20 months old. But I'll buy an adaptor DP to VGA from eBay or Amazon... for new videocard urgently. What's best adaptor? Because 980 Ti may be risk of death in this year or next few years despite zero issues.

Why would it be in risk of death?

Graphics cards can fail eventually (heat damage, fan failure, water cooler failure, broken VGA pin, etc).

When it suddenly goes, numinho1980 will no longer be able to use the CRT monitor because no new graphics cards on the market have a VGA output anymore. Not even a DVI-I output compatible with a zero-lag DVI-to-VGA adaptor. To continue using the CRT with future graphics cards, he will need an adaptor.

Also, one issue is adaptors can add lag. Some are less lag and others are more lag.

This specific conversion pair (DisplayPort into VGA) is particularly high in latency risk, because DisplayPort is a micro packet standard, which requires mandatory microbuffering (a few scanlines worth). The rolling-window micro buffer can be less than 1 millisecond (line-based) but some adaptors have built in full-frame buffers (one refresh cycle worth) that adds up to 16.7ms lag at 60 Hertz or 8.3ms lag at 120 Hz. What this means, at the end of the day, different DisplayPort-to-VGA adaptor will very quite a bit in lag.

One can test lag yourself with SMTT 2.0 -- two CRTs, one unadaptored and one adaptored -- use SLR camera -- and find out the differential in lag for the adaptor.

You might be right but i seriously think it's going to live long after your estimate. Unless it's a lower end 980ti with bad VRMs it's probably going to last a while.

RealNC wrote:Why would it be in risk of death?

We remember most GeForce videocards are died abnormally during ~2 years old due to the VRAM issue - Samsung may be bad brand. Kingston for VRAM is good brand for 15~20 years normally.


HDMI to VGA adaptor is as high lag as DP-VGA, ok?

nuninho1980 wrote:We remember most GeForce videocards are died abnormally during ~2 years old due to the VRAM issue - Samsung may be bad brand. Kingston for VRAM is good brand for 15~20 years normally.

There was a time where there was a big batch of bad cards but I think the manufacturers learned their lessons (I hope)

nuninho1980 wrote:HDMI to VGA adaptor is as high lag as DP-VGA, ok?

It's hard to say. Digital to analog conversions all have buffer risk, you have to test the adaptor and make sure that it's not one of the laggy ones.

Ideally it should be negligible difference (sub-millisecond difference) but in the real world....

Admin: Thank you for your info.

Does DP work 50 Hz (vertical frequency)?

nuninho1980 wrote:Admin: Thank you for your info.

Does DP work 50 Hz (vertical frequency)?

It works with any frequency. But I don't know if adapters can introduce a limitation.

RealNC wrote:It works with any frequency. But I don't know if adapters can introduce a limitation.

They do.
But it's very adaptor-specific.

Ideally, adaptors should be transparent to all pixel clocks within its specifications, and pass through anything you've configured in ToastyX CRU -- this is how you get analog FreeSync working (HDMI-to-VGA adaptor).

Thank you. But I've knew G-Sync/FreeSync don't support any CRT because any CRT has always FIXED vertical frequency only but yes GUESS VRR.